Unit tests fail on master branch with old Linux distribution

[adamqqqplay]

Additional Information

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Version of nydus being used (nydusd --version)

master branch@ 43e6518

Version of nydus-snapshotter being used (containerd-nydus-grpc --version)

Kernel information (uname -r)

5.4.0-148-generic

GNU/Linux Distribution, if applicable (cat /etc/os-release)

NAME="Ubuntu"
VERSION="20.04.6 LTS (Focal Fossa)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 20.04.6 LTS"
VERSION_ID="20.04"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=focal
UBUNTU_CODENAME=focal

containerd-nydus-grpc command line used, if applicable (ps aux | grep containerd-nydus-grpc)

client command line used, if applicable (such as: nerdctl, docker, kubectl, ctr)

make ut-nextest

Screenshots (if applicable)

Details about issue

Some unit test fails on Ubuntu 20 (kernel 5.4.0-148-generic), but they work fine on Ubuntu 22 (kernel 5.15.0-43-generic). Maybe these errors are expected? But for unit testing, the behavior should not change due to different kernel versions.

        FAIL [   0.068s] nydus-service blob_cache::tests::test_meta_blob
        FAIL [   0.060s] nydus-service block_device::tests::test_block_device

My opinion is that it would be best to fix these unit tests, or move them into integration tests.

[imeoer]

cc @jiangliu